Twisting spindle balloon compensating device



Oct. 21, 1952 H. c. UHLIG TWISTING SPINDLE BALLOON COMPENSATING DEVICE 3 SheetsSheet 1 Filed March 27, 1951 INVENTOR flew/er C. (/l-lL/G BY a 5 ATTORNEYS Oct. 21, 1952 H. c. UHLIG v TWISTING SPINDLE BALLOON COMPENSATING DEVICE,

3 ShQet-s -Sheet '2 Filed March 27, 1951 INVENTOR flax/er C. (/x/uc; I

Oct. 21, 1952 H. c. uuue ,614,

TWISTING SPINDLE BALLOON COMPENSATING DEVICE Filed March 27, 1951 3 Sheets-Sheets INVENTOR v A EMQY C. U/lL/ ATTORNEYS Patented Oct. 21, 1952 s PATENT OFFICE TWISTING SPINDLE BALLOON I "COMPENSATINGADEVICE Henry QtiUl lig, Clifton, N. J., assignor to Howe Twister Corporation, Jersey City, N. J a corporation of New Jersey Applic'ationMarch 27, 1951, Serial No. 217,739

This'zinvention relates to a device for imposing tensioneupon elongated flexible. material travelling lunder. tension. in. the direction of itslength. .Morewparticularly, the device of the invention provides; .meansfor automatically adding to the initialtension of the material a suificient added variable. tension to render the tension on the material leaving. the .device substantially constant and of a desired predetermined amount.

-'; a .preferred'embodiment thereof, the invention relates to a device for controlling the ten- .sion. atthe infeeding end of a balloon of a takeup twisting spindle, and to the combination of such; device with one or 'more supply spindles leach delivering twisted material therefrom inthe form of a balloon,;the material being 'feddirectly from such supply balloon orballcons into the; infeeding balloon of the second,- take-up, twisting. spindle, orgtwisting and cabling device.

Intsuch combination the compensating device of the invention functions ,to maintain. a balance between the tension or tensions in, the supply balloonor balloons and the tension inthe balloon of the ,second,take-up, twisting spindle, or the cabling and twisting device. I

; In'the illustrative embodiment of the tension compensating device here disclosed, it is; shown in the same general combination of twisting apparatus for elongated flexible materials such as yarn as that shown in Uhlig PatentNo. 2,487,837, November 15, 1949, and also that shown in the application of Bogdanfiy et al., Serial No. 59,392, filed November'lO, 1948, and the application of Henry C. Uhlig, Serial No. 127,380, filed November 15, 1949, both such'applications being entitled fApparatus for and Method of Cabling Threads. The apparatus of the present invention is designed, in the; illustrative embodiment, to replace the driven gathering pulley 33 and the tension compensating device 35' of the aforesaid Uhlig patent, and to replace the frictionally braked gathering pulley 66, 68 of the aforesaid Bogdanfiy et' al. and Uhlig applications. The device of the present invention provides a means for much closer control of the cabling and twisting balloon of the take-up spindle than is possible with the above-referred to prior apparatus. The device of the invention imposes a first, substantially constant, tension-upon the gathered, as yet untwisted-upon-each-other,- strands of material issuing from the balloons of the supply spindles, whereby to effect a balance between such tensions and the tension in the ballo'on of the take-up or cabling and twisting spindle when the latter is at its optimum diameter. The de- 3 Claims. (01. 57-58) ,vicefurther incorporates means for detecting the tension-in the balloon of the take-up spindle, and forautomatically adding tension to or subtractingit from the aforesaid substantially constant tension, so that when, the tension in the take-up balloon deviates. from an optimumvalue it is quickly restored thereto, andthat consequently the diameter of such take-upballoon is maintained of a substantially constant diameter.

RI-he invention is capable of; use to advantage in other applications-than that shown and described. Such device may be used,,for example,

inmany other applications involving the feeding of. elongated flexible material froma firstgzone, inwwhich it, is under an initial smaller tension, into a second zoneof larger tension, such. larger tension tending to vary, where it is-desired to maintain the second larger tension substantially constant, :The invention willbe more readily'understood byreference -to the, accompanying drawings forming a part of the specification, in which: Fig-,1 a somewhat schematic viewinfront elevation of a three-spindle twisting apparatus employing the compensating device of-the-inven- Fig 2 isan enlarged view infront elevation of the tension compensating device; Fig.- 3 is a view in endelevation of the compensating device, such view being taken from the line 3 3 in Fig, 2; i

Fig. 4 is a view in perspective of the compensating device, showing the path of travel of the elongated flexible material therethrough;

Fig. 5 is a fragmentary view in end elevation showing the relationship between the friction disc of the'deyice, for causing the imposition of a variable tension upon the material, and the material upon which it acts, inthe position which such disc assumes when the tension in the'balloonof the spindle to which the material is fed is at the desired optimum amount; 1 Fig. 6 is a view similar to Fig. 5 showing the relationship between the material andthe friction disc which is momentarily assumed when :thetension in the aforesaid balloon has-exceeded the optimum value; and c 1 9 Fig. 7 is a view similar to Figs. 5 and 6 showing the-relationship between the friction disc and the material operated upon when the tension in the balloon to which the material is fed has momentarily decreased below saidoptimum value; I Y

IniFig. 1 there is shown the same generalcombination of twisting apparatus as is shown Fig. 1 of each of the above mentioned Bogdanfiy et a1. and Uhlig applications, the compensating device of the present invention being substituted in such combination for the gathering pulley 60 and the friction braking means 66, 68 associated therewith shown in said applications. In Fig. 1 of the present "application there are shown two singles spindles 2 and '4 which two-for-one twist elongated flexible material such as flat rayon yarn supplied from bobbin or package 34, such spindles delivering the double-twisted -material therefrom in balloons 46 and 54, respectively. As shown in connection with spindle 2, such elongated material 44 is delivered'f-romthepackage through the tension device "38,downthrough the driven twisting guide 40 in the spindle M, and

is then delivered outwardly into the balloon 46 through the fiyer 42. The double-twisted materials 50 and 58 are delivered, as shown, up"- wardly through their respective eyes48 and 56 to the "compensatingidevioe to of the invention, to be described more particularly hereinafter. From such compensating device "the material, designated 80, i and con'si'stiiig of the two strands 50 and 58 'in 'generally parallel relationship, but as yet iintwistedupon iea'ch other, is led downwardly i thr ough the :eye -82 into the -ba1loon '84 of tlie ica-bliri'g and -twisting take-up spindle B. The material froin b'alloon 04 entersat its lower end into the nyer 92, and then rises u wardly on itra' ver se device "46, by means of ithe Y capstan I90, :whioh is 'positiv'ely driven in timed relationship with'the fiye'r: 92 of spindle Ii. The cord is laid :upon the bobbin I26 of the -"s'pindle by the guide piill'ey I44, thebobbin being driven from the driven spindle through the medium' of a Vai bl'e magnetic cliiteh N03. The details or the a paratus thus far "described, which are fully disclosed in the a-bovefmentioned patent and a plications, "form'no par t o'r the present inventio -exee t as they contribute to the general Cor'iibihatiohdf the twisting apparatus and the present compensating device. The twisting spindies 2, 4, and 6 are =driven ithrough pulleys 22, 24, and 25, respectively, whicheontact theb'elt 32 driven by pull'ey flon motor 1'6; 'As shown, for the partiemar application in hand, "the two spindles 2 and 4 are driven in one fdirec'tion, and spindle 6 is driven in the' reverse-direction. "The '6mpensating -"dvide or the invention, which is designated generall by "the reference character I50, isattaehed, as-showh in Figs. 1 and 2, to the horizontal frame member -02 "of the twistingmaehinel 'Dn-the machinefinsuch location th-at thematerial 8 ll is deliv'e'red toth'e 'eye 82 elon'g a substantially vertical path as the apparatus is depic -ted i'n Fig. 1, there is located the 's'tandar'd"64 which-is provided with amenlarged head 66. 'Head 616 is-slotted to provide vertically extending ears E8, there being *a gen-- erally horizontal 'first-class lever I0 pivotally carried between the ears -'on -pivot -"pin 12. on top of the ears =68, which 'are of 1 such 1 height as to allow free oscillation of lever "I 0" between: desired'li'mits, thereisi-se'curedthe base 14 of an u lierst'andardpart "I6. Standard 516 has a head 1-8 which supports the upper elongated member 8-6 in horizontal position, therrear, reduced diameter, portion #88 =o'f member 86 being received in a bore in head I8 and being pinned thereto.

The'forward end -90 of member 86 carries on its outer-end the double-groovedguide pulley 96,

such pulley being freely rotatably mounted upon the pin 94 which secures it to member 86. The rear groove in pulley 96, which constitutes a first fixed position guide, is designated I00 and the front groove, which constitutes a second fixed position guide, is designated 98. The forward arm I02 of lever 10 carries'onitsiouter end, by means of the pin I06,'the 'freely'r'otatable composite member I08 which combines the guide pulley having the groove I I0and the brake memberactuating disc I I2.

I Undei -operating conditions, as will be more fully explained, the lever I0 is constantly urged infa counterclockwise direction, as it is shown in"Fig.-3,'-by means of the coil tension spring I35 which its'top'end fixedly secured to the rear *end of the upper supporting member 88. The

bottom end of the spring I36 is adjustably connec'tedto the rear arm I04 of lever 10 by means of the L-shaped connector member I50, to the upper end =of-ithe Vertical portion ot which the of connector 150 carries "screwed 'thereinto 'i-the. vertical set -'sc'rew I52, the upper :end of such "screw fitting within one *of a series of vlongitudi- 'end' "of screw 1&2 1 in the desired depre'ssion II-50 withsuch serewdn, for example, its midposi-tion relative "to mart I 54. "Eurther, finer; adjustment of the :tEIISlOH Of the 'spring may be'TSBClIIBd iby screwing "member I52 into, or withdrawing it from, ithe member'ilv54. -*a result, the force with *wh iehlever 10 is impelled in a counterclockwisezdirection:maybeso selected as to maintain-a predetermined optimum itension in' material' LBO issuing from the compensating device. The ti-friction disc EH32 is made upiof the etwo spaced parallel 'fia'nge's having ith'e szgroove -122 therebetween, the forward fla'nge being 'desigridted of 3 and the rear han s i 120: "the groove 122 extends from .the-.--peripnery of the disc inwardly to the root I2 4 th eredf rnereiatienship btween the gr'oo'v 88 a -I 00 df the 'upper guide-pulley SB, "the grooves I I0 and 'ofthe bofitom s'tructure lflilgiainlidf eye U-Z-f Figs. )1, s, 6, and-'7 Whenftlie lever 10' is 'in its normal position corresponding to *th'e'optimu tension in the takeup balloon, that is, when the "axis A -Aof s'u'chf lever lie'sfpa'ra llel to member is-0; as indicated in grooves 'rm: and H0 'aif'ever'ticall aligned Q When the-never is in siich'jpo'sition, the mate a'l. I34 proceeding from the groove "98 into "the groove '12: oi the friction disc and thence, 1 as material 80 into eye 82, contacts thelinner'face I'IEB -off'the liange T20 o'f'member -I08 "f;r0m.its initial contact at ',the upper inner corner "I6'2"to ajpoirit somewhat above the aXiso'f di-sc 1.0-8, "at whichflpeintnlit leaves such suriiace I58,-a's s'hown.in-Fig. 5. 'i'l1e root I24 or-groove I12 .in structure 408 has a diameter substantially the same as the smallest diameter of groove Be a-r d the axes of .members :and 108 .are in vertical alignment, whereby thematerial I 34 will, contact suehjrootl fl of structure mumm if atall, indtstravel-downwardly through-the-slot in thetri'ction-disc.

. Thetwisted single strand ea isbrought up from eye 45:6 once around grpul'ley I I4 of; the yardage counter I-I G, =from;which it @proceeds to the-top of; groove -I 00 in 2 guiding.;;pulley 95. Thetwisted strand eeds :brought up ate; the under side-of roove I00. The two strands arethus combined at suchgroove and afterpassing over the top of thegroove are led directlyltherefrom down into the groove IIO on structure I08. .Such run of the material is .designated I30, being most clearly shown in Fig. 4; The two strands are wrapped about the groove. IIO, preferably for substantially two complete turns, so that substantially no slippage takes place between the material and the groove IIO of the pulley; The -two.- parallel strands are then led'upwardlyfrom groove H in a run designated =I32 to the groove -98 of pulley 96, the runs I30 and, I32 of the strands impelling pulley 96 in the same'direction. After passing over thetop of groove.98, the two parallel strands are then led, in the run I34, directly down through the slot I22 betweenthe flanges I I2 and I20,'the material below such friction discbeing designated 80. The material 80, as shown in Fig. 1, then enters theeye 82 after which it is formed intothe take-up balloon 84'.

As above indicated, the compensating device 60 of the invention functions to maintain the tension in balloon 84, and thus the diameter of the balloon, substantially constant. When the heavier, multi-filament materials such as yarns of 1650 and 2200 denier, for example, are twisted in the apparatus, the tension in balloon 84 substantially exceeds the sum of the tensions in balloons 46 and 54. Accordingly, to maintain the take-up balloon in substantial balance with the singles balloons it is necessary to add a retarding tension to the material between the singles balloons and the take-up balloon.

.Device 60 imposes a first, substantially constant, retarding tension to the material passing .therethrough by reason ofthe internal friction inithe material itself as it is bent around the pulleygrooves I00, H0, and 98, and also by reason ofthe friction between such material and thesurfaces of the pulley grooves. Such first added tension does not change materially, even though the lever I0 pivots slightly about its horizontal ,axis in a manner to.be explained. In addition to the above referred to substantially constant tension imposed on the material by device 60 there is also the substantially constant retarding tension imposed on the material by reason of the passage of strand 58 once around "the counter. pulley II 4.

Device 60 imparts a second, automatically varied, tension. to the material passing around pulley groove I I0 thereof, as a result of the interactionv between such elongated flexible material and the flanges H8 and I20 of friction disc II2. It will be apparent that disc H2 is substantially positively rotated by means of travel of the cord around groove IIO. When the lever I0 lies substantially parallel to member 00, with the tension in balloon 84 at its optimum value, frictional contact between the run I34 of the material and the disc II2 is,.as shown in Fig. 5, confined to a distance somewhat less than one-half the height of the disc at a point beginning at the upperinner corner I62 of face I58 of flange I20. The major variable frictional restraint thus imposed upon the material by groove IIO of means I08, vsuch means IOB.being retarded by w the interaction between the material in run I34 restraint at pulley H4 and also the, restraint by reason of the passage of the material about grooves IIO, I00, and 98, is sufficient to create a balance between the tension in balloon .84 and of balloon 84, has been the variation in tension in such balloon 84. The device 60 of the invention, by providing means for automatically varying-the retarding effect upon the .material by groove I I0 as governed by friction disc. '2, automatically compensates for such variations in tension in balloon 84. In Fig. 6 there is shown somewhat schematically the relationship .between disc I I2 and the run I34 of the material passing there- -through upon an increase in tension in balloon 84. :When such increase in tension occurs, itis immediately reflected. inanincreased tension in run I32 of thematerial in device 60.. Such increased tension in run I32 causes the lever I0 to rotate clockwise against theaction of spring: I36

' (Fig. 3), thereupon supplying an increased length of material to the balloon..84 to prevent its being pulled inwardly into contact with therubxring I40 on the spindle 6. Such slight rotation ofi'the lever I0 causes the disc II2 to assume the angularrelationship shown in Fig. 6, wherein the axis A--A of the disc lies, .at the right, at anangle' B below the normal position thereof. When the disc I I2 has attained such position, the material I34 is freed from contactwith sidewalls I58 of flange. I20, and the disc will not 'haveswung-sufiicien'tly to cause contact between such material and the'side Wall I60 of flange I I8. Consequently, the frictional retardation imposed on disc I I2 by the material falls substantially to zero, andmeans I08, including groove IIO,rotates' freely. .fIBhe tension upon thev material enteringballoon. .84 is accordingly decreased, and thus, due to the. corresponding decrease in tension .in run I34 of the material, the lever I0 is allowed, under the action of spring I36, to resume the normal operating position shown in Fig. 5. I

When the tension inballoon 84 has decreased from the normal optimum tension, the disc I I2 assumes the position shown in Fig. 7, wherein thelever I0 has turned counterclockwise (Fig. 3) sufficiently to allow the axis AA.of disc I I2, at the right, to lie an angle C abovethe normal position thereof. When the disc occupies such position, the material in run I34 is, in effect, pinched between the side walls 158 and I60 of flanges I20 and H8, respectively, the contact being most forceful at the outer edges ItZ and I64 of such flanges, respectively. The disc II2'thus imposes a markedly increased retardation upon the rotation of means I08, including groove -I I0, over that which it imposes in its normal operating position shown in Fig. 5, so that the material enters balloon .84 under increased tension, and the balloon is prevented from fblowing 'outf When the desired tension has been restored to balloon, 84, the tension in run. I32 accordingly rises and the lever I0 is restored to the. position represented in Fig. 5.

Since the disc I I2 need contact run I34 of the material only lightly, due to the largediameter of such disc relative to groove I I0 of the retarding guide roll, the tension in balloon 84 is transmitted substantially unchanged to run I32 of the material. When the sum of the tensions in the singles balloons remains at least generally constant, as it appears to do in the combination disclosed, the main variant in the forces opposing the action of spring I36 on groove IIO of the '7 .roller guide is the tension in the doubles .balloon 84. The roller guide-with its mounting therefore "constitute a means :ifor detecting :or .measuring tension, and the changes .in such tension, in:the material in balloon fi i. Such tension detectin imeans, acting through the .disc H2, functions i'automatically to vary the retarding force imposed" on "the :material passing about .groove H sbyiimposing :a retarding torque on rmeans 1.98. Contact ib'etween :run 134 .and one or .:both of flanges H8 and E2001 the disc 12E], when such discl' is tin either of :thetpositions shown in :Figs. rand takes place .at all times on the side of sthe idlSO which travelling downwardly. The

disc iis'ttravellin- :almost .at right :angles 'torsuch .runscf material at the line .of contact. Furthermore, lathe :speed .of the disc -I 12 adjacent :edges rlliziand 164, where contact with the material is -mostz'forcef1il, exceeds the'peripheralspeed of groove 1 I0. 'Thus material 134 does not :tend to ldrivezdisc H2, when it contacts its flanges, but

:ratheritends .toiretardzit.

lt will be appreciatedrfrom the above that the compensating device :of the .lDVGIItlOIl'Il'S simple and economical to make, and that it is substantially maintenancefree. Because the disc H2 is positively rotatedlby the cord engaging; the groove 51H), the wear over the inner surfaces 'of the diangesio'f the disciseVenly distributedand thus the .disc may 'be used for a. long .period without replacement. Contact between. the inner materialxengaging surfaces of the disc H2 and the elongated flexible material occurs in directions .sosnearly tangential to the surfaces of the disc, and such .light "contactis required between the material and the surfaces of the disc to effect marked braking action at groove Hi], that there :is little if any-tendencyrfort'such surfaces toscuff the -.material and to break the fllaments thereof. :It ;will also be appreciated that, .oncethe tension whichspring 136 exerts upon lever l0 .has been adjusted, the device will operate with substantially complete freedom from sattentionzto'mainitain the tension and thus the diameter .of bal- ,loonfid of the desired value.

:Whereas for, purposes of illustration I .have shown and described .a,-preierred embodiment .of the :twisting spindle balloon compensating zdevice =andzthe combination of such device with a multicpindle twisting machine, .it willlbe understood that withinithe scope of the, inventionthe device is capable of considerable variationasstodetails .and'also as tothe'mannerlof its application. .The invention is therefore to be defined by the scope of-the claims appended hereto. I claimzas new .thefollowing:

11. -A tension compensating :dev-ice ifor elongated material travellinginthe .directicnof its length from :a *flrstzone :of initial tension into .a second :zone of greater :tension, comprising means for detecting the tension in the material at the tension device, said :tension detecting means includingxazroller :guide deflected in :re- .sponse to changes .in -1the itension in'theTm-aterial, means mounting the rollerguide to "allow :such deflection, :means constantly urging the guide roller in :such directionas to oppose deflection :by the material, aimember positioned byith'e roller guide mounting means' fonvariably retarding rotation of .theroller guide by frictionsally engaging a run of the material after it-has left the .tension detecting means, and :means connecting the roller guide retarding member :to'the roller guide so that saidroller guide re- -tardstthe material with a variable force.

.,..2. A tension .ccompensating devicejfor ,elongated material travelling :in'the direction :of its length rfrom :aiirst zone of :initial, substantially constant, tension intoa second zone of greater, variable, tension, comprising means for detect- .ing :the tension in the material at the tension adevice, said tension-detectin means includ n azroller guide deflected ,in .response to-changes in the tensionin thematerial, means -mounting ;.the roller :guide to allowsuch deflection,:means constantly urging the guide .roller in :such :direction as to oppose deflection -by the :material, a member positioned bythexroller guide-mounting means'for variably .Lretarding rotation .of the roller guide by. :frictionally engaging :a .run of the material after it has left the tension measuring,

means, and means connecting the roller .rgui'cie retarding "member :to "the, :roller guide so that said .roller guide retards the :material with :a

variable :force. .7 o

3. .A 'tension;-c.ompensating device .for Lelongated material travelling in the direction of its length from a iirstizone of initial tension into :a 'secondaone :of greater tension, comprising means for detecting the tension inthe material at the tension :device, said tension detect- ,ing .means including a rollerguide, deflected in response to changes in :the tension :in the .material, zineans. mounting the roller guide ior travel in such directionfas to be variably deflected by the material, means constantly urging theguide roller-in such direction as :to oppose deflection by the material, 'a roller guide retarding member.:mounted to move with "the roller guide, such retarding member engaging with variable :force :a run of the material after it ;has left .the tension detecting means, :and means connecting the roller guide retarding member'tothe roller guide so that said :roller 2guide;.retards thematerialxwith a variable force.

A tension compensating device for elongated :material travelling :in the direction of itslengthffrom :a firstzone of initial tension into a second zone of greater tension, comprising 'meanstfor detecting the tension in the material at the :tension device, said tension detecting meansincluding :a roller guide deflected in response rto changes in tension "in the material, means mounting the :1101161 guide (for travel such direction as to vary the \amount'of deflection of the .material, means constantly urging zthetroller guide in such direction asttooppose :deiiection by "the material, a roller guide retarding .memberconnected to rotate 'withithe roller :guide :and :mounted to move with the roller guide in its "deflection, such retarding member engaging with variable "force 'arun of the material :after -.it has left the tension'detecting means. I

:5. atension mompensating device for elongated :material travelling in the direction of its .lengthcfrom ,axfirstizone of initial tension into a second :zone :of greater :tension, comprising a first flxed position guide engaging the material .as :it approaches tthe Itension device, a second fixed position guide spaced therefrom, a roller guide engaging and driven by the 'material :in itsttravel between the first and second fixed guides, a support for the roller guide comprismg a lever mounted "for oscillation about an axis transverse to the length of the lever, the miller guide sbeingzmounted on the lever, means constantly urging the lever against the force of :the :material deflected by the roller guide, "a rotatable disc mounted on "the lever, the disc being so mounted that a run of material from the second fixed position guide extends roughly parallel to a side face. of the disc, said side face of the disc variably engaging the material generally in accordance with the amount of displacement of the roller guide from its normal operating, position, and means drivingly connecting the disc to the roller guide.

6. A tension compensating device for elongated material travelling in the direction of its length from a first zone of initial tension into a second zone of greater tension, comprising means for detecting the tension in the material the second zone thereof, including a first fixed position guide engaging the material as it approaches the tension device, a second fixed positionv guide spaced therefrom, a roller guide engaging and driven by the material in its travel between the first and second fixed position guides, a support for the roller guide comprising a lever mounted for oscillation about an axis transverse to the length of the lever, the roller guide being mounted on the lever, means constantly urging the lever against the force of the material deflected by the guide roll, a roller guide retarding disc mounted on the lever, the disc being positioned adjacent to and drivingly connected to the roller guide, said disc having a slot transverse to its axis inwardly from its periphery and parallel to the broad surfaces thereof, the disc being so mounted that a run of material from the second fixed position guide extends through the slot in the disc and roughly parallel to the plane of the slot therein, said side walls of the slot engaging the material with a forcewhich is variable generally in accordance with the amount of displacement of the roller guide from its initial operating, position with the material just contacting a sidewall of the slot.

'7. Apparatus for twisting elongated fiexible filamentary material such as yarn in one continuous operation comprising a plurality of twofor-one twisting spindles each of the type which forms filamentary material extending therefrom into a free-flying first balloon, means associated with each spindle for imposing a predetermined back tension on such material, a two-for-one twisting device of the type forming and receiving filamentary material from a second freeflying balloon, said device including means for drawing in twisted material from the latter balloon, means for gathering together the twisted materials from the first balloons and leading such materials in gathered relation into the second balloon to form the latter, tension compensating means for maintaining said second balloon under yielding variable tension, said last named means acting to maintain the tension in the second balloon in balance with the sum of the tensions in the first balloons, and means for driving said twisting spindles and said twisting device in synchronism, said tension compensating means comprising means for detecting the tension in the material in the secand balloon. said tension detecting means including a roller guide deflected'in response to changes in the tension, in the material, means mounting the roller guide to allow such deflection, means constantly urging the guide roller in such directionas to oppose deflection by the material, a member positioned by the roller guide mounting means for variably retarding rotation of the roller guide by frictionally engaging a run of the material after it has left the tension detecting means, and means connecting the roller guide retarding member to the roller guide so that said roller guide retards the material with a variable force.

8. Apparatus for twisting elongated flexible filamentary material such as yarn in one continuous operation comprising a plurality of twofor-one twisting spindles each of the type which forms filamentary material extending therefrom into a free-flying first balloon, means associated with each spindle for imposing a predetermined back tension on such material, a two-for-one twisting device of the type forming and receiving filamentary material from a second free-flying balloon, said device including means for drawing in twisted material from the latter baling device in synchronism, said tension com-' pensating means comprising a first fixed position guide engaging the material as it approaches the tension device, a second fixed position guide spaced therefrom, a roller guide engaging and driven by the material in its travel between the first and second fixed guides, a support for the roller guide comprising a lever mounted for oscillation about an axis transverse to the length of the lever, the roller guide being mounted on the lever, means constantly urging the lever against the force of the material deflected by the roller guide, a rotatable disc mounted on the lever, the disc being positioned adjacent to and drivingly connected to the roller guide, said disc having a slot transverse to its axis inwardly from its periphery and parallel to the broad surfaces thereof, the disc being so mounted that a run of material from the second fixed position guide extends through the slot in the disc and roughly parallel to the plane of the slot therein, said side walls of the slot engaging the material with a force which is variable generally in accordance with the amount of displacement of the roller guide from an initial, operating, position with the material just contacting a sidewall of the slot.

HENRY C. UHLIG.

No references cited. 

